Currently my combo is Wii/PC/64
Wii b/c I love Mario, Smash, Metroid games with good controls, and the occasional great third party game in MH3 and Boom Blox Bash Party, aswell as other creative puzzle games. Backwards compatability is great too.
PC...anything that can play on my laptop ie Borderlands, Orange Box, and Hitman Trilogy.
64 b/c Virtual console is a failure.
Being a poor college student directs what I can own. Damn you Gregiore...
If I had to invest in an HD console it would most certainly be 360. Of my friends who own an HD console, ~75% own a 360. Halo, Gears, Shadow Complex, Limbo and great online appeal to me. Sony has finally gotten some great exclusives, but I can't draw myself to support Sony's videogame philosophy and legacy.
I'm content with my current videogame ownership. Wii has kept my attention and will keep doing so with D freakin K making a return.